>
>> In an old 5CX3000A 1.6-32MHz amp I am working on,
>> the plate blocking caps are rated at 8KV. Can I
>> guesstimate from this what plate voltage was intended?
>-
>I have worked on FM broadcast transmitters and Henry HF
>amplifiers using the 5CX1500A and B series tubes. If you
>want information about any of said, I can supply it.
>-
>Henry made (IMO) a dog of an HF amplifier using this tube,
>for a short time it was popular in Elcom Bauer and Sparta
>FM Broadcast Transmitters. Probably other brands used it.
>-
>The Sparta 602 is a long lasting unit running a tap selected
>output,high voltage supply is used to set the output power.
>From memory the thing would easily honk 2200 plus watts
>out on 95.3 Mhz a big 24/7 .
>-
>The tube can be rebuilt... I was told the A&B versions are a
>bit different, which includes separate socket requirements,
>but actual direct swapping worked in two VHF examples.
>-
>Gas is a big concern... I would give it at least an two to four
>hours warm up after a slow ramp to the rated min filament
>voltage. Depends on how long it's been idle.
>-
>This tube seems more sensitive to proper heater voltage than
>any other I've worked with. I would never apply screen voltage
>without something near the proper min anode potential.
>When its going full tilt, it is an incredibly bright light source.
Does light come from the ceramic anode-insulator? If so, what color is
the light?
thanks
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
end
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